Drum Brake System: Service and Repair
REMOVAL1. Remove the wheel and tire, then remove the brake drum.
NOTE: If the brake drum is difficult to remove, insert bolts into the threaded holes of the drum, then remove it.
2. After removing the rear hub bearing flange nut, remove the rear hub with the brake drum.
3. Remove the shoe return spring, cylinder end shoe spring, the shoe hold down spring.
4. Remove the shoes and adjuster as an assembly.
INSPECTION
1. Measure the inside diameter of the brake drum. Check the runout of brake drum by using a dial indicator.
Inside diameter
Standard value 228.6 mm (9 inch)
Service limit 230.6 mm (9.08 inch)
2. Measure the brake shoe lining thickness.
Standard value Service limit
Lining thickness
Standard value 4.45 mm (0.18 inch)
Service limit 1.5 mm (0.059 inch)
3. Inspect the brake lining and drum for proper contact.
4. Inspect the wheel cylinder outside for excessive wear and damage.
5. Inspect the backing plate for wear or damage.
INSTALLATION
1. Apply the specified grease to the locations indicated in the illustration and to each component.
- Shoe and backing plate contact surfaces
- Shoe and anchor plate contact surfaces
Recommended grease: Multipurpose grease SAE J310, NLGI No. 2
2. Install the shoe hold down pin.
3. Assemble the return spring by pressing the push rod.
CAUTION: Split pin and hub cap must not be reused.
4. Check the outside dimension and correct it using auto-adjuster (227.6 - 228.1 mm).
5. Do the parking brake stroke adjustment after assembling lining.